* libgloss/m68k/Makefile.in (BDM_BSP, BDM_OBJS, BDM_ISRS): New.

	(CF_SCRIPTS): Rename dbug scripts.  Add bdm scripts. Add m5485
	scripts.
	(all): Add new targets.
	(BDM_BSP): New target.
	(bdm-isv.o, bdm-exit.o, bdm-outbyte.o, bdm-semihost.o): New
	targets.
	(BDM_ISRS): New targets.
	(m5208evb.ld, m5213evb.ld, m5235evb.ld, m5272c3.ld, m5282evb.ld):
	Rename and adjust.
	(m5485evb-dbug): New.
	(m5208evb-bdm.ld, m5213evb-bdm.ld, m5235evb-bdm.ld,
	m5272c3-bdm.ld, m5282evb-bdm.ld, m5485evb-bdm.ld): New.
	(install): Add BDM_BSP.
	* libgloss/m68k/bdm-exit.c: New
	* libgloss/m68k/bdm-inbyte.c: New
	* libgloss/m68k/bdm-outbyte.c: New
	* libgloss/m68k/bdm-semihost.c: New
	* libgloss/m68k/bdm-semihost.h: New
	* libgloss/m68k/bdm-isrs.c: New.
	* libgloss/m68k/bdm-isv.c: New.
	* cf-dbug.sc: Renamed to ...
	* cf.sc: ... here.  Add bdm flexibility. Remove GROUP

10 files changed, 583 insertions, 15 deletions

diff --git a/ChangeLog.csl b/ChangeLog.csl
index 6293719ed..ff9e3295e 100644
--- a/ChangeLog.csl
+++ b/ChangeLog.csl
@@ -1,3 +1,29 @@
+2006-03-29  Nathan Sidwell  <nathan@codesourcery.com>
+
+	* libgloss/m68k/Makefile.in (BDM_BSP, BDM_OBJS, BDM_ISRS): New.
+	(CF_SCRIPTS): Rename dbug scripts.  Add bdm scripts. Add m5485
+	scripts.
+	(all): Add new targets.
+	(BDM_BSP): New target.
+	(bdm-isv.o, bdm-exit.o, bdm-outbyte.o, bdm-semihost.o): New
+	targets.
+	(BDM_ISRS): New targets.
+	(m5208evb.ld, m5213evb.ld, m5235evb.ld, m5272c3.ld, m5282evb.ld):
+	Rename and adjust.
+	(m5485evb-dbug): New.
+	(m5208evb-bdm.ld, m5213evb-bdm.ld, m5235evb-bdm.ld,
+	m5272c3-bdm.ld, m5282evb-bdm.ld, m5485evb-bdm.ld): New.
+	(install): Add BDM_BSP.
+	* libgloss/m68k/bdm-exit.c: New
+	* libgloss/m68k/bdm-inbyte.c: New
+	* libgloss/m68k/bdm-outbyte.c: New
+	* libgloss/m68k/bdm-semihost.c: New
+	* libgloss/m68k/bdm-semihost.h: New
+	* libgloss/m68k/bdm-isrs.c: New.
+	* libgloss/m68k/bdm-isv.c: New.
+	* cf-dbug.sc: Renamed to ...
+	* cf.sc: ... here.  Add bdm flexibility. Remove GROUP
+
 2006-03-23  Mark Mitchell  <mark@codesourcery.com>
 
 	* libc/sys/arm/Makefile.am (extra_objs): Add _exit.o _nmi_isr.o
diff --git a/libgloss/m68k/Makefile.in b/libgloss/m68k/Makefile.in
index 8faf5ffcf..e781d1d02 100644
--- a/libgloss/m68k/Makefile.in
+++ b/libgloss/m68k/Makefile.in
@@ -123,7 +123,26 @@ IDPGDB_OBJS=	leds.o idp-inbyte.o idp-gdb-outbyte.o mc68ec.o
 DBUG_BSP=	libdbug.a
 DBUG_OBJS=	dbug-exit.o dbug-inbyte.o dbug-outbyte.o
 
-CF_SCRIPTS=   m5208evb.ld m5213evb.ld m5235evb.ld m5272c3.ld m5282evb.ld
+#
+# here's all the BDM semihosting stuff
+#
+BDM_BSP=	libbdm.a
+BDM_OBJS=	bdm-exit.o bdm-inbyte.o bdm-outbyte.o bdm-isv.o \
+		bdm-semihost.o $(patsubst %,bdm-%.o,${BDM_ISRS})
+BDM_ISRS=	other_interrupt reset access_error address_error \
+	illegal_instruction divide_by_zero privilege_violation \
+	trace unimplemented_line_a_opcode unimplemented_line_f_opcode \
+	non_pc_breakpoint_debug_interrupt pc_breakpoint_debug_interrupt \
+	format_error spurious_interrupt trap0 trap1 trap2 trap3 trap4 \
+	trap5 trap6 trap7 trap8 trap9 trap10 trap11 trap12 trap13 trap14 \
+	trap15 fp_branch_unordered fp_inexact_result fp_divide_by_zero \
+	fp_underflow fp_operand_error fp_overflow fp_input_not_a_number \
+	fp_input_denormalized_number unsupported_instruction
+
+CF_SCRIPTS=   m5208evb-dbug.ld m5213evb-dbug.ld m5235evb-dbug.ld \
+	m5272c3-dbug.ld m5282evb-dbug.ld m5485evb-dbug.ld \
+	m5208evb-bdm.ld m5213evb-bdm.ld m5235evb-bdm.ld \
+	m5272c3-bdm.ld m5282evb-bdm.ld m5485evb-bdm.ld
 
 # Host specific makefile fragment comes in here.
 @host_makefile_frag@
@@ -132,7 +151,7 @@ CF_SCRIPTS=   m5208evb.ld m5213evb.ld m5235evb.ld m5272c3.ld m5282evb.ld
 # build a test program for each target board. Just trying to get
 # it to link is a good test, so we ignore all the errors for now.
 #
-all: ${SIM_CRT0} ${SIM_BSP} ${CRT0} ${BCC_BSP} ${IDP_BSP} ${IDPGDB_BSP} ${MVME135_BSP} ${MVME162_BSP} ${DBUG_BSP} ${CF_SCRIPTS}
+all: ${SIM_CRT0} ${SIM_BSP} ${CRT0} ${BCC_BSP} ${IDP_BSP} ${IDPGDB_BSP} ${MVME135_BSP} ${MVME162_BSP} ${DBUG_BSP} ${BDM_BSP} ${CF_SCRIPTS}
 
 #
 # here's where we build the board support packages for each target
@@ -157,6 +176,10 @@ ${DBUG_BSP}: $(OBJS) ${DBUG_OBJS}
 	${AR} ${ARFLAGS} $@ $(OBJS) ${DBUG_OBJS}
 	${RANLIB} $@
 
+${BDM_BSP}: $(OBJS) ${BDM_OBJS}
+	${AR} ${ARFLAGS} $@ $(OBJS) ${BDM_OBJS}
+	${RANLIB} $@
+
 ${MVME135_BSP}: $(OBJS) ${MVME135_OBJS}
 	${AR} ${ARFLAGS} $@ $(OBJS) ${MVME135_OBJS}
 	${RANLIB} $@
@@ -165,21 +188,52 @@ ${MVME162_BSP}: $(OBJS) ${MVME162_OBJS}
 	${AR} ${ARFLAGS} $@ $(OBJS) ${MVME162_OBJS}
 	${RANLIB} $@
 
-m5208evb.ld: dbug-cf.sc Makefile
+bdm-isv.o : bdm-isv.c bdm-semihost.h
+bdm-exit.o : bdm-exit.c bdm-semihost.h
+bdm-outbyte.o : bdm-outbyte.c bdm-semihost.h
+bdm-semihost.o : bdm-semihost.c
+	$(CC) $(CFLAGS_FOR_TARGET) $(INCLUDES) -c $< -o $@ -fomit-frame-pointer
+
+$(patsubst %,bdm-%.o,${BDM_ISRS}) : bdm-isrs.c
+	$(CC) $(CFLAGS_FOR_TARGET) $(INCLUDES) -c $< -o $@ \
+	  -DL_$(patsubst bdm-%.o,%,$@) -fno-omit-frame-pointer
+
+m5208evb-dbug.ld: cf.sc Makefile
 	RAMSTART=1024M RAMSIZE=16M RAMDBUG=128K ${SHELL} $< > $@
 
-m5213evb.ld: dbug-cf.sc Makefile
+m5213evb-dbug.ld: cf.sc Makefile
 	RAMSTART=512M RAMSIZE=32K RAMDBUG=8K ${SHELL} $< > $@
 
-m5235evb.ld: dbug-cf.sc Makefile
+m5235evb-dbug.ld: cf.sc Makefile
 	RAMSTART=0M RAMSIZE=16M RAMDBUG=64K ${SHELL} $< > $@
 
-m5272c3.ld: dbug-cf.sc Makefile
+m5272c3-dbug.ld: cf.sc Makefile
 	RAMSTART=0M RAMSIZE=4M RAMDBUG=128K ${SHELL} $< > $@
 
-m5282evb.ld: dbug-cf.sc Makefile
+m5282evb-dbug.ld: cf.sc Makefile
 	RAMSTART=0M RAMSIZE=16M RAMDBUG=64K ${SHELL} $< > $@
 
+m5485evb-dbug.ld: cf.sc Makefile
+	RAMSTART=0M RAMSIZE=64M RAMDBUG=128K ${SHELL} $< > $@
+
+m5208evb-bdm.ld: cf.sc Makefile
+	ISV=1 RAMSTART=1024M RAMSIZE=16M ${SHELL} $< > $@
+
+m5213evb-bdm.ld: cf.sc Makefile
+	ISV=1 RAMSTART=512M RAMSIZE=32K ${SHELL} $< > $@
+
+m5235evb-bdm.ld: cf.sc Makefile
+	ISV=1 RAMSTART=0M RAMSIZE=16M ${SHELL} $< > $@
+
+m5272c3-bdm.ld: cf.sc Makefile
+	ISV=1 RAMSTART=0M RAMSIZE=4M ${SHELL} $< > $@
+
+m5282evb-bdm.ld: cf.sc Makefile
+	RAMSTART=0M RAMSIZE=16M ${SHELL} $< > $@
+
+m5485evb-bdm.ld: cf.sc Makefile
+	ISV=1 RAMSTART=0M RAMSIZE=64M ${SHELL} $< > $@
+
 leds.o: ${srcdir}/leds.c
 	$(CC) $(CFLAGS_FOR_TARGET) $(INCLUDES) -c $<
 
@@ -298,6 +352,9 @@ install:
 	$(INSTALL_DATA) ${srcdir}/mvme162.ld $(DESTDIR)$(tooldir)/lib${MULTISUBDIR}/mvme162.ld
 	# install DBUG stuff
 	$(INSTALL_PROGRAM) $(DBUG_BSP) $(DESTDIR)$(tooldir)/lib${MULTISUBDIR}/$(DBUG_BSP)
+	# install BDM stuff
+	$(INSTALL_PROGRAM) $(BDM_BSP) $(DESTDIR)$(tooldir)/lib${MULTISUBDIR}/$(BDM_BSP)
+
 	$(INSTALL_DATA) ${srcdir}/sbc5204.ld $(DESTDIR)$(tooldir)/lib${MULTISUBDIR}/sbc5204.ld
 	$(INSTALL_DATA) ${srcdir}/sbc5206.ld $(DESTDIR)$(tooldir)/lib${MULTISUBDIR}/sbc5206.ld
 	for script in $(CF_SCRIPTS) ; \
diff --git a/libgloss/m68k/bdm-exit.c b/libgloss/m68k/bdm-exit.c
new file mode 100644
index 000000000..9cb422bee
--- /dev/null
+++ b/libgloss/m68k/bdm-exit.c
@@ -0,0 +1,31 @@
+/*
+ * bdm-exit.c -- 
+ *
+ * Copyright (c) 2006 CodeSourcery CSI
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+#include "bdm-semihost.h"
+
+/* 
+ * _exit -- Exit from the application.  
+ */
+
+void __attribute__ ((noreturn)) _exit (int code)
+{
+  while (1)
+    __asm__ __volatile__ ("move.l %0,%/" BDM_ARG_REG "\n"
+			  "moveq %1,%/" BDM_FUNC_REG "\n"
+			  "trap %2"
+			  :: "rmi" (code), "n" (BDM_EXIT), "n" (BDM_TRAP)
+			  : BDM_FUNC_REG,BDM_ARG_REG,BDM_RESULT_REG,"memory");
+}
diff --git a/libgloss/m68k/bdm-inbyte.c b/libgloss/m68k/bdm-inbyte.c
new file mode 100644
index 000000000..1163dd852
--- /dev/null
+++ b/libgloss/m68k/bdm-inbyte.c
@@ -0,0 +1,24 @@
+/*
+ * bdm-inbyte.c -- 
+ *
+ * Copyright (c) 2006 CodeSourcery CSI
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+
+/* Read a character from the input.  This is currently unsupported.
+   */
+
+int inbyte (void)
+{
+  return -1;
+}
diff --git a/libgloss/m68k/bdm-isrs.c b/libgloss/m68k/bdm-isrs.c
new file mode 100644
index 000000000..6a68d211a
--- /dev/null
+++ b/libgloss/m68k/bdm-isrs.c
@@ -0,0 +1,192 @@
+/*
+ * bdm-isv.c -- 
+ *
+ * Copyright (c) 2006 CodeSourcery CSI
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+/* This file contains default interrupt handlers code for the
+   interrupt vector.  All but one of the interrupts are user
+   replaceable.
+
+   These interrupt handlers are entered whenever the associated
+   interrupt occurs.  All they do is stop the debugger to give the user
+   the opportunity to determine where the problem was.
+  
+   User trap BDM_TRAP (15) is used for semi hosting support.
+   If you replace this one, semihosting will cease to function. */
+
+
+/* Each ISR is a loop containing a halt instruction  */
+#define ISR_DEFINE(NAME) 					\
+void __attribute__((interrupt_handler)) NAME (void)		\
+{								\
+  while (1)							\
+    __asm__ __volatile__ ("halt" ::: "memory");			\
+}								\
+struct eat_trailing_semicolon
+
+#if defined (L_other_interrupt)
+ISR_DEFINE (__other_interrupt);
+#endif
+
+#if defined (L_reset)
+ISR_DEFINE (__reset);
+#endif
+
+#if defined (L_access_error)
+ISR_DEFINE (__access_error);
+#endif
+
+#if defined (L_address_error)
+ISR_DEFINE (__address_error);
+#endif
+
+#if defined (L_illegal_instruction)
+ISR_DEFINE (__illegal_instruction);
+#endif
+
+#if defined (L_divide_by_zero)
+ISR_DEFINE (__divide_by_zero);
+#endif
+
+#if defined (L_privilege_violation)
+ISR_DEFINE (__privilege_violation);
+#endif
+
+#if defined (L_trace)
+ISR_DEFINE (__trace);
+#endif
+
+#if defined (L_unimplemented_line_a_opcode)
+ISR_DEFINE (__unimplemented_line_a_opcode);
+#endif
+
+#if defined (L_unimplemented_line_f_opcode)
+ISR_DEFINE (__unimplemented_line_f_opcode);
+#endif
+
+#if defined (L_non_pc_breakpoint_debug_interrupt)
+ISR_DEFINE (__non_pc_breakpoint_debug_interrupt);
+#endif
+
+#if defined (L_pc_breakpoint_debug_interrupt)
+ISR_DEFINE (__pc_breakpoint_debug_interrupt);
+#endif
+
+#if defined (L_format_error)
+ISR_DEFINE (__format_error);
+#endif
+
+#if defined (L_spurious_interrupt)
+ISR_DEFINE (__spurious_interrupt);
+#endif
+
+#if defined (L_trap0)
+ISR_DEFINE (__trap0);
+#endif
+
+#if defined (L_trap1)
+ISR_DEFINE (__trap1);
+#endif
+
+#if defined (L_trap2)
+ISR_DEFINE (__trap2);
+#endif
+
+#if defined (L_trap3)
+ISR_DEFINE (__trap3);
+#endif
+
+#if defined (L_trap4)
+ISR_DEFINE (__trap4);
+#endif
+
+#if defined (L_trap5)
+ISR_DEFINE (__trap5);
+#endif
+
+#if defined (L_trap6)
+ISR_DEFINE (__trap6);
+#endif
+
+#if defined (L_trap7)
+ISR_DEFINE (__trap7);
+#endif
+
+#if defined (L_trap8)
+ISR_DEFINE (__trap8);
+#endif
+
+#if defined (L_trap9)
+ISR_DEFINE (__trap9);
+#endif
+
+#if defined (L_trap10)
+ISR_DEFINE (__trap10);
+#endif
+
+#if defined (L_trap11)
+ISR_DEFINE (__trap11);
+#endif
+
+#if defined (L_trap12)
+ISR_DEFINE (__trap12);
+#endif
+
+#if defined (L_trap13)
+ISR_DEFINE (__trap13);
+#endif
+
+#if defined (L_trap14)
+ISR_DEFINE (__trap14);
+#endif
+
+#if defined (L_trap15)
+ISR_DEFINE (__trap15);
+#endif
+
+#if defined (L_fp_branch_unordered)
+ISR_DEFINE (__fp_branch_unordered);
+#endif
+
+#if defined (L_fp_inexact_result)
+ISR_DEFINE (__fp_inexact_result);
+#endif
+
+#if defined (L_fp_divide_by_zero)
+ISR_DEFINE (__fp_divide_by_zero);
+#endif
+
+#if defined (L_fp_underflow)
+ISR_DEFINE (__fp_underflow);
+#endif
+
+#if defined (L_fp_operand_error)
+ISR_DEFINE (__fp_operand_error);
+#endif
+
+#if defined (L_fp_overflow)
+ISR_DEFINE (__fp_overflow);
+#endif
+
+#if defined (L_fp_input_not_a_number)
+ISR_DEFINE (__fp_input_not_a_number);
+#endif
+
+#if defined (L_fp_input_denormalized_number)
+ISR_DEFINE (__fp_input_denormalized_number);
+#endif
+
+#if defined (L_unsupported_instruction)
+ISR_DEFINE (__unsupported_instruction);
+#endif
diff --git a/libgloss/m68k/bdm-isv.c b/libgloss/m68k/bdm-isv.c
new file mode 100644
index 000000000..a9fba3117
--- /dev/null
+++ b/libgloss/m68k/bdm-isv.c
@@ -0,0 +1,148 @@
+/*
+ * bdm-isv.c -- 
+ *
+ * Copyright (c) 2006 CodeSourcery CSI
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+/* This file contains default interrupt handlers and initialization
+   code for the interrupt vector.  All but one of the interrupts are
+   user replaceable.
+
+   User trap BDM_TRAP (15) is used for semi hosting support.
+   If you replace this one, semihosting will cease to function. */
+
+#include "bdm-semihost.h"
+
+#define NUM_VECTORS 256
+
+#define ISR_DECLARE(NAME) void __attribute__((interrupt_handler)) NAME (void)
+
+ISR_DECLARE (__other_interrupt);
+ISR_DECLARE (__reset);
+ISR_DECLARE (__access_error);
+ISR_DECLARE (__address_error);
+ISR_DECLARE (__illegal_instruction);
+ISR_DECLARE (__divide_by_zero);
+ISR_DECLARE (__privilege_violation);
+ISR_DECLARE (__trace);
+ISR_DECLARE (__unimplemented_line_a_opcode);
+ISR_DECLARE (__unimplemented_line_f_opcode);
+ISR_DECLARE (__non_pc_breakpoint_debug_interrupt);
+ISR_DECLARE (__pc_breakpoint_debug_interrupt);
+ISR_DECLARE (__format_error);
+ISR_DECLARE (__spurious_interrupt);
+ISR_DECLARE (__trap0);
+ISR_DECLARE (__trap1);
+ISR_DECLARE (__trap2);
+ISR_DECLARE (__trap3);
+ISR_DECLARE (__trap4);
+ISR_DECLARE (__trap5);
+ISR_DECLARE (__trap6);
+ISR_DECLARE (__trap7);
+ISR_DECLARE (__trap8);
+ISR_DECLARE (__trap9);
+ISR_DECLARE (__trap10);
+ISR_DECLARE (__trap11);
+ISR_DECLARE (__trap12);
+ISR_DECLARE (__trap13);
+ISR_DECLARE (__trap14);
+ISR_DECLARE (__trap15);
+ISR_DECLARE (__fp_branch_unordered);
+ISR_DECLARE (__fp_inexact_result);
+ISR_DECLARE (__fp_divide_by_zero);
+ISR_DECLARE (__fp_underflow);
+ISR_DECLARE (__fp_operand_error);
+ISR_DECLARE (__fp_overflow);
+ISR_DECLARE (__fp_input_not_a_number);
+ISR_DECLARE (__fp_input_denormalized_number);
+ISR_DECLARE (__unsupported_instruction);
+
+/* The trap used for semihosting by the debugger.  This must have a
+   particular assembly signature, so we don't generate it with the
+   compiler.   */
+ISR_DECLARE (__bdm_semihosting);
+
+/* The interrupt vector itself must be provided by the linker script
+   as it requires 1MB alignment. */
+extern void (*__interrupt_vector[NUM_VECTORS])(void);
+
+/* The linker script sets the stack pointer too.  */
+extern int  __attribute__ ((weak)) __stack;
+
+/* This hook is called during crt startup and installs and initializes
+   the vector table.  It is overridable by a user provided routine.
+   If the user routine fails to install the __bdm_semihosting routine,
+   semihosting will cease to function.   */
+
+void  software_init_hook (void)
+{
+  unsigned ix;
+
+  /* Don't set it if it's -1 (zero is a valid value) */
+  if ((long)&__interrupt_vector == -1)
+    return;
+  
+  for (ix = 0; ix != NUM_VECTORS; ix++)
+    __interrupt_vector[ix] = &__other_interrupt;
+  
+  /* Set the VBR. */
+  __asm__ __volatile__ ("movec.l %0,%/vbr" :: "r" (&__interrupt_vector));
+
+  /* Set an initial stack and reset vector, in case we unexpectedly get
+     reset.  */
+  __interrupt_vector[0] = (&__stack ? (void (*)(void))&__stack
+			   : (void (*)(void))&__interrupt_vector[NUM_VECTORS]);
+  __interrupt_vector[1] = &__reset;
+  
+  /* Store the known interrupt vectors */
+  __interrupt_vector[2] = &__access_error;
+  __interrupt_vector[3] = &__address_error;
+  __interrupt_vector[4] = &__illegal_instruction;
+  __interrupt_vector[5] = &__divide_by_zero;
+  __interrupt_vector[8] = &__privilege_violation;
+  __interrupt_vector[9] = &__trace;
+  __interrupt_vector[10] = &__unimplemented_line_a_opcode;
+  __interrupt_vector[11] = &__unimplemented_line_f_opcode;
+  __interrupt_vector[12] = &__non_pc_breakpoint_debug_interrupt;
+  __interrupt_vector[13] = &__pc_breakpoint_debug_interrupt;
+  __interrupt_vector[14] = &__format_error;
+  __interrupt_vector[24] = &__spurious_interrupt;
+  __interrupt_vector[32] = &__trap0;
+  __interrupt_vector[32] = &__trap1;
+  __interrupt_vector[32] = &__trap2;
+  __interrupt_vector[32] = &__trap3;
+  __interrupt_vector[32] = &__trap4;
+  __interrupt_vector[32] = &__trap5;
+  __interrupt_vector[32] = &__trap6;
+  __interrupt_vector[32] = &__trap7;
+  __interrupt_vector[32] = &__trap8;
+  __interrupt_vector[32] = &__trap9;
+  __interrupt_vector[32] = &__trap10;
+  __interrupt_vector[32] = &__trap11;
+  __interrupt_vector[32] = &__trap12;
+  __interrupt_vector[32] = &__trap13;
+  __interrupt_vector[32] = &__trap14;
+  __interrupt_vector[32] = &__trap15;
+  __interrupt_vector[48] = &__fp_branch_unordered;
+  __interrupt_vector[49] = &__fp_inexact_result;
+  __interrupt_vector[50] = &__fp_divide_by_zero;
+  __interrupt_vector[51] = &__fp_underflow;
+  __interrupt_vector[52] = &__fp_operand_error;
+  __interrupt_vector[53] = &__fp_overflow;
+  __interrupt_vector[54] = &__fp_input_not_a_number;
+  __interrupt_vector[55] = &__fp_input_denormalized_number;
+  __interrupt_vector[61] = &__unsupported_instruction;
+
+  /* Install the special handler. */
+  __interrupt_vector[0x20 + BDM_TRAP] = &__bdm_semihosting;
+}
diff --git a/libgloss/m68k/bdm-outbyte.c b/libgloss/m68k/bdm-outbyte.c
new file mode 100644
index 000000000..dd787f89d
--- /dev/null
+++ b/libgloss/m68k/bdm-outbyte.c
@@ -0,0 +1,32 @@
+/*
+ * bdm-outbyte.c -- 
+ *
+ * Copyright (c) 2006 CodeSourcery CSI
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+#include "bdm-semihost.h"
+
+/*
+ * outbyte -- output a byte to a console.
+ */
+
+void outbyte (char c)
+{
+  int code = c & 0xff;
+  
+  __asm__ __volatile__ ("move.l %0,%/" BDM_ARG_REG "\n"
+			"moveq %1,%/" BDM_FUNC_REG "\n"
+			"trap %2"
+			:: "rmi" (code), "n" (BDM_PUTCHAR), "n" (BDM_TRAP)
+			: BDM_FUNC_REG,BDM_ARG_REG,BDM_RESULT_REG,"memory");
+}
diff --git a/libgloss/m68k/bdm-semihost.c b/libgloss/m68k/bdm-semihost.c
new file mode 100644
index 000000000..3628191f3
--- /dev/null
+++ b/libgloss/m68k/bdm-semihost.c
@@ -0,0 +1,25 @@
+/*
+ * bdm-semihost.c -- 
+ *
+ * Copyright (c) 2006 CodeSourcery
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+/* Semihosting trap.  The debugger intercepts this and
+   performs the semihosting action.  Then the program resumes as
+   usual.  This function must be compiled without a frame pointer, so
+   we know the halt instruction is the very first instuction.  */
+	
+void __attribute__ ((interrupt_handler)) __bdm_semihosting (void) 
+{
+  __asm__ __volatile__ ("halt" ::: "memory");
+}
diff --git a/libgloss/m68k/bdm-semihost.h b/libgloss/m68k/bdm-semihost.h
new file mode 100644
index 000000000..c71b1ade8
--- /dev/null
+++ b/libgloss/m68k/bdm-semihost.h
@@ -0,0 +1,35 @@
+/*
+ * bdm semihosting support.
+ *
+ * Copyright (c) 2006 CodeSourcery CSI
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+/* Semihosting uses a user trap handler containing a HALT
+   instruction.  This wakes the debugger to perform some action.  */
+
+/* This is the semihosting trap hander */
+#define BDM_TRAP 15
+
+/* This register holds the function enumeration for a semihosting
+   command.  */
+#define BDM_FUNC_REG "d0"
+/* This register holds the argument for the semihosting call.  */
+#define BDM_ARG_REG  "d1"
+/* This register holds the result of a semihosting call.  */
+#define BDM_RESULT_REG  "d0"
+
+/* Program exit.  Argument is exit code.  */
+#define BDM_EXIT  0
+
+/* Output char to console.  Argument is char to print.  */
+#define BDM_PUTCHAR  1
diff --git a/libgloss/m68k/dbug-cf.sc b/libgloss/m68k/cf.sc
index 0342ed1fd..c4c303d0b 100644
--- a/libgloss/m68k/dbug-cf.sc
+++ b/libgloss/m68k/cf.sc
@@ -2,15 +2,13 @@
 # RAMSTART - start of board's ram
 # RAMSIZE - size of board's ram
 # RAMDBUG - bytes at start of RAM for DBUG use
+# ISV - nonnull if interrupt service vector should be provided.
 
 cat <<EOF
 STARTUP(crt0.o)
 OUTPUT_ARCH(m68k)
-/* DBUG loads SREC files */
-/*OUTPUT_FORMAT(srec)*/
 ENTRY(start)
 SEARCH_DIR(.)
-GROUP(-ldbug -lc -lgcc -ldbug)
 __DYNAMIC  =  0;
 
 MEMORY
@@ -19,20 +17,19 @@ MEMORY
 		 LENGTH = ${RAMSIZE} - ${RAMDBUG:-0}
 }
 
+/* Place the stack at the end of memory, unless specified otherwise. */
 PROVIDE (__stack = ${RAMSTART} + ${RAMSIZE});
 
+/* Inhibit an interrupt vector, if one is not specified.  */
+PROVIDE (__interrupt_vector = -1);
+
 /*
  * Initalize some symbols to be zero so we can reference them in the
  * crt0 without core dumping. These functions are all optional, but
  * we do this so we can have our crt0 always use them if they exist. 
- * This is so BSPs work better when using the crt0 installed gcc.
- * We have to initalize them twice, so we cover a.out (which prepends
- * an underscore) and coff object file formats.
  */
 PROVIDE (hardware_init_hook = 0);
-PROVIDE (_hardware_init_hook = 0);
 PROVIDE (software_init_hook = 0);
-PROVIDE (_software_init_hook = 0);
 /*
  * stick everything in ram (of course)
  */
@@ -41,6 +38,7 @@ SECTIONS
   .text :
   {
     CREATE_OBJECT_SYMBOLS
+    ${ISV+__interrupt_vector = .; . += 256 * 4;}
     *(.text .text.*)
 
     . = ALIGN(0x4);